Here's a tip: all the mounts in the game are identical in terms of their utility. You can upgrade your riding skill to make them faster, etc., but the differences on the mounts themselves are only cosmetic.

I got the 10,000g horse a few days ago, but tonight I finally saved up enough gold for one of the ~43k horses and thank jeebus I did some research first on what the differences were... They're still priced based on their obsolete status as superior mounts! They used to have different stats and you could upgrade individual horses and all that, but they streamlined it when the game went B2P I guess. So the only thing I would gain by spending all that gold is a different skin...

So yeah, don't make the mistake I almost did. The more expensive horses are not faster, do not have more stamina, and won't increase your carry load. You do that by improving your riding skills, paying 250g once a day at a stablemaster to slightly increase one of the stats. Or if you don't want to take several months to max those out, I believe there is a mount upgrade pack you can buy for real money.

That massively overhauling update we heard about before has been released! The main feature of "One Tamriel" is that all content is dynamically scaled to you (or the other way around), so you can go anywhere and do anything as soon as you are out of the tutorial. You still level up and collect loot that is more powerful the higher level you are, but level differences are largely eliminated by the scaling so that anyone can group up and do things together. It no longer matters that I've played way more than you guys! Or at least not as much.

They've also removed alliance restrictions in PVE content (be any race you want), redesigned a previously end-game group-centric area to be playable solo or with fewer players, and rebalanced all dungeons to have normal and veteran difficulties. Item sets have been made to be more abundant in both the variety available and the ease of attaining them, and they will scale to your level. Dark Anchor events have been spiced up, open world bosses are more difficult (I used to be able to solo most of them, now they actually need a group), and supposedly all harvest nodes will scale to your level and/or crafting rank.